Thermostatic unit



Dec. 3o, 1941. J E WOODS 2,268,176

' THERMOSTATIC UNIT Filed June 4, 1940 i Y @www MW bha,

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ing legsA 29. t bonded to the bottom of the cup preferably by PatentedDec. 30, '1 941 UNITED STATES PATENToF -2,268,176 Fics I v THERMUSTATICUNIT John E. Woods, Brookline, Mass., assigner to Cliord ManufacturingCo., Boston, Masa., a

corporation of Delaware Application Janet, 1940, serial No. 338,747

1 claim. (cl. 297-8) The present invention relates to improvements inthermostatic units, and is more particularly concerned withMimprovements in such units which embody a sea1edin actuator and attachedcapillary for remote control. i

The object of the invention is to improve and reorganize such units forthe purpose of increasing thereliability and ruggedness asv handled inthe ordinary application, and with the above andother objects in view,the various features of the invention consist in certain novel featuresof construction, combinations and arrangeend of the capillary is sealedto the cup bottom.

By spacing. the bridge and opening I6 upon the same diameter at oppositesides of the centena substantial length of the capillary is supported incomparison with the diameter of'the cup, and a superior resistanceisobtained as compared withy the support of the capillary in closeproximity to its entering point.

ments of parts hereinafter described and claimed, the advantages ofwhich will be obvious to those skilled in the art from the followingdescription.

In the accompanying'drawing illustrating the preferred form of theinvention, Fig. 1 represents a bottom plan view of the unit; and Fig. 2is a section in elevation of the unit beforeinsertion of the capillary.

Upon inspection of the drawing, -it will be ob-l l Y necked opening I6and sealed or bonded thereto by solder 24 as indicated. The lengthwiseportion of the capillary contacts with and lies against the flat bottomportion extending from the opening diametrically across the bottom to anexternal point beyond the margin.

The length of the capillary is positioned and reinforced by a clip 25,which as shown in Fig.v

2 may take the form of a raised bridge or guiding portion 21 formedintegral with two anchor- These legs engage with and are The cup-shapedhousing encloses an operating diaphragm which is sealed therein and issube ject to the fluctuations in pressure introduced into the interior32 of theshousing through the capillary. This diaphragm may be of theform indicated in Fig. 2 in which a dished head portion 34 forms part ofa two-fold bellows wall 36 provided with an enlarged fold 38 which isbonded to the wall of the cup-shaped housing and serves to anchor thediaphragm in posi. tion. Subject to fluctuations of pressure within thespace y32, the movable wall 341 -is raised and lowered nto control anexternal operating member.

Asdndicated again in Fig. 2, the entire assembly withi the 'housing isenclosed by a disk-l like cover 40 bonded at its outer periphery to thehousing at 42, the edge of the c ver, as shown,

seating within a recess 44 formed in the wall of the housing. Theinterior of the Acover is provided with a central opening 46, whichrests upon the head of the diaphragm and limits outward movement, asealing disk 48 being inter? posed' therebetween to seal the interior ofthe diaphragm inthe outward position. Attached to the movable head 34may be a U-shaped bracket 50 which projects beyond the cover and servesvas .a connection forI operating any appropriate inenclosing the'diaphragm, the housing spot welding, and the raised bridge portionuaffords sumcient space therebetween and the bottom of the cup for` thepassage of the capillary tubing.

The opening 30 presented by the bridge faces the opening in the cupbottom and is generally aligned with the longitudinal axis of thecapillary which passes therethrough. 'I'here may be a slightclearancebetween the capillary and bridge .when in position to permit insertionof the capillary after the bridge has been secured to the cup bottom.

strumentality such as a switch. l

What is'claimed is:

`A thermostatic unit comprising a movable diaphragm, a cup-shapedhousing of drawn metal ,includingj an integral bottom provided with arecessed portion having formed therein an inwardly vextending neckedopening of smaller diameter than the recess, a length of capillarytubing having an end portion turned angularly with respect to its lengthand received within the necked opening, the portion of the capillary inthe vicinity of the turn being free of the recessed portion of thehousing to permit a continuous circular bond by soldering or the likebetweenf'capillary and housing around the necked opening, the length ofcapillary lying in juxtaposition to the bottom portion of the cup andextending outwardly beyond the margin, and means for anchoring thecapillary to the bottom ofthe housing at a point remote from the pointof connection adjacent the y necked opening, said anchoring meanscomprising a clip bridging the capillary and secured to the bottom ofthe housing.

y t .JOHN E. woons.

